Expected: ACCEPT rules for UDP. If missing or DROP/REJECT exists, blocking is confirmed.
FileCatalyst is a high-speed file transfer protocol (UDP-based) optimized for transferring large data sets over high-latency or lossy networks (e.g., satellite links, intercontinental WANs). However, organizations frequently encounter scenarios where FileCatalyst traffic becomes , resulting in failed transfers, degraded throughput, or connection timeouts. This paper identifies the root causes of blocking events and prescribes actionable remediation steps. filecatalyst blocked
FileCatalyst blocking is almost always due to , aggressive UDP rate limiting , or NAT incompatibility . Resolution requires systematic testing at each network layer and, where necessary, architectural fallback to TCP/HTTPS. For mission-critical environments, proactive monitoring of UDP port reachability and firewall rule expiry is strongly recommended. Expected: ACCEPT rules for UDP
: In early 2024, a major vulnerability ( CVE-2024-25153 ) was discovered that allowed Remote Code Execution (RCE). Many security systems now block unpatched versions of FileCatalyst Workflow (older than version 5.1.6 Build 114) by default. Resolution requires systematic testing at each network layer
FileCatalyst (now part of IBM Aspera) provides a connectivity validation tool: fc-diag . Run fc-diag --target <ip> --port 33001 to receive a structured block diagnosis report.
In Windows Security , navigate to Virus & threat protection > Protection history to see if a FileCatalyst process (like TransferAgent.exe ) was recently blocked. You can select Allow on device to whitelist it.